CertiSigma provides cryptographic proof for digital evidence by attesting to the existence and integrity of files, reports, and other digital materials without requiring the original content to leave the user's environment. The platform addresses the challenge organizations face in demonstrating that specific digital evidence existed in a particular form at a given time, offering a mechanism for producing externally verifiable references without acting as a document archive itself.
The process begins with a SHA-256 digest calculated locally within the user's systems—such as browsers, repositories, or client infrastructure—ensuring that the original content remains private and is never transmitted or stored by CertiSigma. CertiSigma then attests to this digest using a qualified eIDAS-compliant timestamp and anchors the proof on the Bitcoin blockchain. This creates a portable, time-stamped, and third-party verifiable evidence bundle. The platform supports workflows where only the digest and selected operational metadata are sent to CertiSigma, and it offers a public verifier that operates entirely within the browser, meaning files themselves are not uploaded. For sensitive metadata or predictable inputs, the platform recommends client-side HMAC or encryption to enhance privacy.
CertiSigma is designed for use cases where external parties—such as auditors, regulators, insurers, or legal counterparts—require proof of the existence, date, and integrity of digital evidence. It integrates with existing systems and workflows, complementing rather than replacing document management or compliance solutions. The platform's operational model emphasizes privacy and sovereignty, with hosting and infrastructure based in Switzerland, and a privacy-by-architecture approach that aligns with GDPR and Swiss data protection regulations. CertiSigma does not store personal data, only the SHA-256 digest and operational metadata.
The platform also provides an open source verifier for this purpose. Qualified timestamps are issued through third-party TSA services, and the Bitcoin anchoring ensures public and long-term validation. CertiSigma offers a free, registration-free attestation service via ExistBefore, powered by the same core technology.
CertiSigma is a Security & compliance platforms product. It focuses on proving the existence and integrity of digital files and evidence in a verifiable, privacy-preserving way. It is built as a B2B product for legal professionals. There is a free tier. The product ships for the web, the command line, and API.
CertiSigma first shipped in 2026. Key capabilities include SHA-256 hashing, eIDAS timestamping, and bitcoin anchoring. It exposes integrations via a public API.
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